Sho Sakurai, because I feel like he would be able to move into either more mature roles or serious newscasting. He's smart enough to have something other than looks going for him... I bet he could even run for Prime Minister (and win) in a couple of decades XD And the younger actors like Miura Haruma will be where big stars (like Oguri Shun) are now in both age and experience, so I think they will remain pretty big.

On the Korean front... maybe in ten years Rain will have finally learned enough English to go full-time Hollywood XDDDD

And anyone who's ever been (or will be) in some adaptation of "Hana Yori Dango" will remain big just because of the insane HYD wave throughout the 1990s and 2000s LOL.

yeah...it always becomes a craze when it comes to HYDs...

as for my opinion, i think actors who are currently in their teens...like :

Hey! Say! JUMP

Miura Haruma

Kim Bum & Kim So Eun

and based on their current popularity, i think 2NE1 can also make it big

i dont know why some people stick with dbsk as the long lasting popular boy band group
well i dont agree with it, coz their contract with sm should be either complete by then or some of them might be off to army which would make them not as big anymore (just like the shinwa guys, who used to be big)